Why do my calendar events display a half hour off from their actual times?

About a week or so ago I noticed my events appear to be about 15-30 minutes off from the actual event time in my calendar. For example, my 8:15a event looks like it is at 8:30a, my 10:30a event looks like it is at 10:45a, my 12:30p visually translates to 12:45p and my 5:30p looks like a 6p event. Why? What can I do to fix this? Not only is this visually annoying, but when I click on the calendar to add an event at the desired time it designates the time a half hour off - super annoying. Does anyone have a solution for this? Thanks!

This has been happening to me as well. It started off as showing up as 15 minutes off. But now it's looking more like a half-hour. What's causing this? I've restarted, refreshed, cleared out cache, etc...